ERP44 and neoplasm: We further selected those tumor MGL binders that were also recognized by VVA in both tumor and cell lines (Figure 3g; Table S5), and, following manual validation of the glycopeptide mass spectra (Figure S5), three molecules were identified as MGL binders: insulin-like growth factor binding protein 7 (IGFBP7), endoplasmic reticulum resident protein 44 (ERp44), and nucleobindin-1 (NUCB1).